| 摘要 |
The invention relates to a process for the recovery of one or more monomers from a gas stream (1), comprising the following stages: within one and the same first extraction column C1, a) a stage of extraction by bringing the gas stream (1) into contact, in an extraction column (C1), with an organic extraction solvent (2), in which the said extraction solvent (2) absorbs the said monomer or monomers, and b) a stage of stripping or desorption with an inert gas in the extraction column (C1), by feeding, at the bottom of the column (C1) and below the feeding of the gas stream (I) laden with monomers, with a stream of inert gas, preferably molecular nitrogen or a gas stream enriched in molecular nitrogen (12), a liquid stream (3) comprising the extraction solvent and the monomer or monomers being recovered at the bottom of the column (C1) and an exiting gas stream (4) being recovered at the top of the column (C1), then within a second recovery column C2, c) a stage of recovery of the said monomer or monomers, in which the said monomer or monomers are separated from the extraction solvent by distillation in a recovery column (C2) fed with the liquid stream (3) recovered at the bottom of the column (C1), a stream comprising concentrated monomer(s) (5) being recovered at the top of the column (C2) and a liquid stream (2) comprising the extraction solvent being recovered at the bottom of the column (C2) and then recycled to the top of the column (C1), the monomer or monomers being chosen from dienes, vinylaromatic compounds and isobutene. |
